CN101873070A - LED (light-emitting diode) drive circuit and power supply circuit and LED lamp thereof - Google Patents
LED (light-emitting diode) drive circuit and power supply circuit and LED lamp thereof Download PDFInfo
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- CN101873070A CN101873070A CN201010207711A CN201010207711A CN101873070A CN 101873070 A CN101873070 A CN 101873070A CN 201010207711 A CN201010207711 A CN 201010207711A CN 201010207711 A CN201010207711 A CN 201010207711A CN 101873070 A CN101873070 A CN 101873070A
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- switch element
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- power supply
- led drive
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The invention provides an LED drive circuit and a power supply circuit and an LED lamp thereof, which are suitable for the field of LED lamps. The power supply circuit of the LED drive circuit comprises a transient power supply unit and a steady-state power supply unit. In the embodiment of the invention, the transient power supply unit supplies power to a PFC (Power Factor Correction) control circuit and a PWM (Pulse-Width Modulation) control circuit by utilizing voltage output by the rectifier bridge of the LED drive circuit, whereas the steady-state power supply unit supplies power to the PFC control circuit and the PWM control circuit by utilizing voltage output by the transformer of the LED drive circuit. The power supply circuit has simple structure and low cost, and when the rectifier bridge does not have output, the power supply circuit stops supplying power to the control circuits, and thereby, the electric energy is greatly saved.
Description
Technical field
The invention belongs to the LED field of light fittings, relate in particular to a kind of led drive circuit and power circuit thereof and LED light fixture.
Background technology
Led drive circuit is widely used as the main circuit of LED light fixture, Fig. 1 shows the structure of existing led drive circuit, comprising: ac input end 1, rectifier bridge 2, PFC (power factor correction) control circuit 3, pwm control circuit 4, switching circuit 5, transformer 6 and power output circuit 7.
In led drive circuit, comprise a lot of integrated control chips; the mode of three terminal regulator or external direct current power supply that these integrated control chips can adopt usually realizes the unified power supply of chip; but this supply power mode complex structure; cost is higher; and also there is a problem in this type of mode; promptly when the rectifier bridge no-output, power circuit can be wasted electric energy so undoubtedly still to chip power supply.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of power circuit of led drive circuit, is intended to solve the problem that there is complex structure in existing power circuit, cost is higher and waste electric energy.
The embodiment of the invention is to realize like this, a kind of power circuit of led drive circuit, be used to comprise the led drive circuit of rectifier bridge, PFC control circuit, pwm control circuit, switching circuit, transformer and power output circuit, described power circuit comprises: transient state power supply unit and steady-state supply unit;
The output of the rectifier bridge of the described led drive circuit of input termination of described transient state power supply unit, the output of described transient state power supply unit connects the PFC control circuit of described led drive circuit and the power end of pwm control circuit respectively, described transient state power supply unit obtains voltage from the output of described led drive circuit rectifier bridge, and is converted into the operating voltage of described PFC control circuit and pwm control circuit;
The input of described steady-state supply unit inserts the transformer of described led drive circuit by a secondary coil;
First output of described steady-state supply unit connects the PFC control circuit of described led drive circuit and the power end of pwm control circuit respectively, be used for by described secondary coil from transformer coupled acquisition voltage, and be converted into the operating voltage that described first output exports described PFC control circuit and pwm control circuit to;
The control end of the described transient state power supply unit of the second output termination of described steady-state supply unit, when first output of described steady-state supply unit has operating voltage output, output control signals to described transient state power supply unit by described second output, in order to cut off the power supply that described transient state power supply unit is described PFC control circuit and pwm control circuit.
Another purpose of the embodiment of the invention is to provide a kind of led drive circuit, and described led drive circuit comprises the power circuit of above-mentioned led drive circuit.
Another purpose of the embodiment of the invention is to provide a kind of LED light fixture, and described LED light fixture comprises above-mentioned led drive circuit.
In embodiments of the present invention, the power circuit of led drive circuit comprises transient state power supply unit and steady-state supply unit, the transient state power supply unit utilizes the voltage of the rectifier bridge output of led drive circuit to be PFC control circuit and pwm control circuit power supply, and the voltage of the transformer of steady-state supply unit by using led drive circuit output is PFC control circuit and pwm control circuit power supply, this circuit construction of electric power is simple, cost is low, and when the rectifier bridge no-output, power circuit just stops electric energy having been saved in the control circuit power supply greatly.
Description of drawings
Fig. 1 is the structure chart of existing led drive circuit;
Fig. 2 is the structure chart of the power circuit of the led drive circuit that provides of the embodiment of the invention;
Fig. 3 is the exemplary circuit figure of the power circuit of the led drive circuit that provides of the embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
The power circuit of the led drive circuit that the embodiment of the invention provides comprises transient state power supply unit and steady-state supply unit, the transient state power supply unit utilizes the voltage of the rectifier bridge output of led drive circuit to be PFC control circuit and pwm control circuit power supply, and the voltage of the transformer of steady-state supply unit by using led drive circuit output is PFC control circuit and pwm control circuit power supply, this circuit construction of electric power is simple, cost is low, and when the rectifier bridge no-output, power circuit just stops electric energy having been saved in the control circuit power supply greatly.
Led drive circuit comprises: ac input end 100, rectifier bridge 200, PFC control circuit 300, pwm control circuit 400, switching circuit 500, transformer 600 and power output circuit 700.
Led drive circuit also comprises power circuit 800, and Fig. 2 shows the structure of the power circuit of the led drive circuit that the embodiment of the invention provides, and for convenience of explanation, only shows the part relevant with the embodiment of the invention.
The output of the rectifier bridge 200 of the input termination led drive circuit of transient state power supply unit 801, the output of transient state power supply unit 801 connects the PFC control circuit 300 of led drive circuit and the power end of pwm control circuit 400 respectively, transient state power supply unit 801 obtains voltage from the output of led drive circuit rectifier bridge 200, and is converted into the operating voltage of PFC control circuit 300 and pwm control circuit 400;
The input of steady-state supply unit 802 inserts the transformer 600 of led drive circuit by a secondary coil;
First output of steady-state supply unit 802 connects the PFC control circuit 300 of led drive circuit and the power end of pwm control circuit 400 respectively, be used for obtaining voltage from transformer 600 couplings, and be converted into the operating voltage that first output exports PFC control circuit 300 and pwm control circuit 400 to by secondary coil;
The control end of the second output termination transient state power supply unit 801 of steady-state supply unit 802, when first output of steady-state supply unit 802 has operating voltage output, outputing control signals to transient state power supply unit 801 by second output, is the power supply of PFC control circuit 300 and pwm control circuit 400 in order to cut off transient state power supply unit 801.
Fig. 3 shows the exemplary circuit structure of the power circuit of the led drive circuit that the embodiment of the invention provides, and for convenience of explanation, only shows the part relevant with the embodiment of the invention.
As one embodiment of the invention, transient state power supply unit 801 comprises:
First end of first switch element 8011 is the input of transient state power supply unit 801, the output that connects rectifier bridge 200, divider resistance R17 is connected between first end and control end of first switch element 8011, second end of first switch element 8011 connects control end by voltage-stabiliser tube Z4, second end of first switch element 8011 also connects first end of current-limiting resistance R54, second end of current-limiting resistance R54 is the output of transient state power supply unit 801, first end of the control termination second switch element 8012 of first switch element 8011, the second end ground connection of second switch element 8012, first end of the control termination divider resistance R44 of second switch element 8012, second end of divider resistance R44 is the control end of transient state power supply unit 801, be connected with divider resistance R41 between the control end of second switch element 8012 and second end, second end of current-limiting resistance R54 is also by capacitor C 5 and voltage-stabiliser tube Z8 ground connection in parallel.
As one embodiment of the invention, first switch element 8011 is metal-oxide-semiconductor Q4, the drain electrode of metal-oxide-semiconductor Q4 is first end of first switch element 8011, be connected with the output of rectifier bridge 200, the source electrode of metal-oxide-semiconductor Q4 is second end of first switch element 8011, be connected with first end of current-limiting resistance R54, the grid of metal-oxide-semiconductor Q4 is the control end of first switch element 8011, connects the drain electrode of metal-oxide-semiconductor Q4 by divider resistance R17.
As one embodiment of the invention, second switch element 8012 is triode Q6, the current collection of triode Q6 is first end of second switch element 8012 very, be connected with the control end of first switch element 8011, the emission of triode Q6 is second end of second switch element 8012 very, be connected with ground, the base stage of triode Q6 is the control end of second switch element 8012, is connected with first end of divider resistance R44.
As one embodiment of the invention, steady-state supply unit 802 comprises:
The 3rd switch element 8021, voltage-stabiliser tube Z1, capacitor C 6, diode D7, diode D8, diode D14 and divider resistance R38;
The anode of diode D7 is the input of steady-state supply unit 802, be connected with secondary coil by divider resistance R39, the negative electrode of diode D7 connects first end of the 3rd switch element 8021, first end of the 3rd switch element 8021 is also by capacitor C 6 ground connection, be connected with divider resistance R38 between first end of the 3rd switch element 8021 and the control end, the control end of the 3rd switch element 8021 is by voltage-stabiliser tube Z1 ground connection, be connected with diode D14 between first end of the 3rd switch element 8021 and second end, second end of the 3rd switch element 8021 is second output of steady-state supply unit 802, second end of the 3rd switch element 8021 also connects the anode of diode D8, and the negative electrode of diode D8 is first output of steady-state supply unit 802.
As one embodiment of the invention, the 3rd switch element 8021 is triode Q5, and the current collection of triode Q5 is first end of the 3rd switch element 8021 very, connects the emitter of triode Q5 by diode D14; The emission of triode Q5 is second end of the 3rd switch element 8021 very, and connects the control end of transient state power supply unit 801; The base stage of triode Q5 is the control end of the 3rd switch element 8021, is connected with the collector electrode of triode Q5 by divider resistance R38.
In this circuit, triode Q6 adopts 3904, is the high frequency low power tube of NPN type, is used in that the prime small-signal amplifies in the amplifying circuit of positive supply power supply; Triode Q5 adopts 2SB887; In addition, each voltage-stabiliser tube is used for determining the size of output voltage V CC in the circuit.
The embodiment of the invention also provides a kind of LED light fixture, and the LED light fixture comprises above-mentioned led drive circuit.
The following describes the operation principle of the power circuit of led drive circuit:
Moment is during power-on, transformer 600 will not have induced current, then steady-state supply unit 802 is inoperative, so rely on transient state power supply unit 801 to produce direct current supply voltage VCC, be specially, rectifier bridge 200 output voltages arrive voltage-stabiliser tube Z4 positive pole through divider resistance R17, produce the 15V burning voltage and open metal-oxide-semiconductor Q4, when metal-oxide-semiconductor Q4 conducting, rectifier bridge 200 output voltages generate direct current supply voltage VCC by current-limiting resistance R54 at the negative electrode of voltage-stabiliser tube Z8.
When transformer 600 is started working, the secondary coil induction obtains electric current, generate a burning voltage by divider resistance R38 at the negative electrode of voltage-stabiliser tube Z1, make triode Q5 conducting, the diode D8 of leading up to generates direct current supply voltage VCC at the negative electrode of voltage-stabiliser tube Z8, and another road is by divider resistance R44, make triode Q6 conducting, the voltage of the grid of metal-oxide-semiconductor Q4 is dragged down, and metal-oxide-semiconductor Q4 ends, thereby makes transient state power supply unit 801 quit work.
From above operation principle as seen, circuit provided by the present invention can be when power supply be just opened moment, be the control chip power supply by transient state power supply unit 801, thereby start PFC control circuit 300 and pwm control circuit 400, in addition, also can be behind the circuit steady operation, transient state power supply unit 801 quits work, and is the control chip power supply by steady-state supply unit 802, guarantee the operate as normal of led drive circuit, this circuit structure is simple, and is easy to operate, and the reliability height.
In the preferred embodiment of the present invention, the power circuit of led drive circuit comprises transient state power supply unit and steady-state supply unit, the transient state power supply unit utilizes the voltage of the rectifier bridge output of led drive circuit to be PFC control circuit and pwm control circuit power supply, and the voltage of the transformer of steady-state supply unit by using led drive circuit output is PFC control circuit and pwm control circuit power supply, this circuit construction of electric power is simple, cost is low, and when the rectifier bridge no-output, power circuit just stops electric energy having been saved in the control circuit power supply greatly.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. the power circuit of a led drive circuit, be used to comprise the led drive circuit of rectifier bridge, PFC control circuit, pwm control circuit, switching circuit, transformer and power output circuit, it is characterized in that described power circuit comprises: transient state power supply unit and steady-state supply unit;
The output of the rectifier bridge of the described led drive circuit of input termination of described transient state power supply unit, the output of described transient state power supply unit connects the PFC control circuit of described led drive circuit and the power end of pwm control circuit respectively, described transient state power supply unit obtains voltage from the output of described led drive circuit rectifier bridge, and is converted into the operating voltage of described PFC control circuit and pwm control circuit;
The input of described steady-state supply unit inserts the transformer of described led drive circuit by a secondary coil;
First output of described steady-state supply unit connects the PFC control circuit of described led drive circuit and the power end of pwm control circuit respectively, be used for by described secondary coil from transformer coupled acquisition voltage, and be converted into the operating voltage that described first output exports described PFC control circuit and pwm control circuit to;
The control end of the described transient state power supply unit of the second output termination of described steady-state supply unit, when first output of described steady-state supply unit has operating voltage output, output control signals to described transient state power supply unit by described second output, in order to cut off the power supply that described transient state power supply unit is described PFC control circuit and pwm control circuit.
2. the power circuit of led drive circuit as claimed in claim 1 is characterized in that, described transient state power supply unit comprises:
First switch element, second switch element, voltage-stabiliser tube Z4, voltage-stabiliser tube Z8, capacitor C 5, divider resistance R17, divider resistance R41, divider resistance R44 and current-limiting resistance R54;
First end of described first switch element is the input of transient state power supply unit, the output that connects rectifier bridge, described divider resistance R17 is connected between first end and control end of first switch element, second end of described first switch element connects control end by voltage-stabiliser tube Z4, second end of described first switch element also connects first end of current-limiting resistance R54, second end of described current-limiting resistance R54 is the output of transient state power supply unit, first end of the described second switch element of control termination of described first switch element, the second end ground connection of described second switch element, first end of the control termination divider resistance R44 of described second switch element, second end of described divider resistance R44 is the control end of transient state power supply unit, be connected with divider resistance R41 between the control end of described second switch element and second end, second end of described current-limiting resistance R54 is also by capacitor C 5 and voltage-stabiliser tube Z8 ground connection in parallel.
3. the power circuit of led drive circuit as claimed in claim 2 is characterized in that, described first switch element is metal-oxide-semiconductor Q4, and the drain electrode of described metal-oxide-semiconductor Q4 is first end of described first switch element, is connected with the output of described rectifier bridge; The source electrode of described metal-oxide-semiconductor Q4 is second end of described first switch element, is connected with first end of described current-limiting resistance R54; The grid of described metal-oxide-semiconductor Q4 is the control end of described first switch element, connects the drain electrode of described metal-oxide-semiconductor Q4 by divider resistance R17.
4. the power circuit of led drive circuit as claimed in claim 2 is characterized in that, described second switch element is triode Q6, and first end of the very described second switch element of the current collection of described triode Q6 is connected with the control end of described first switch element; Second end of the very described second switch element of the emission of described triode Q6 is connected with ground; The base stage of described triode Q6 is the control end of described second switch element, is connected with first end of described divider resistance R44.
5. the power circuit of led drive circuit as claimed in claim 1 is characterized in that, described steady-state supply unit comprises:
The 3rd switch element, voltage-stabiliser tube Z1, capacitor C 6, diode D7, diode D8, diode D14 and divider resistance R38;
The anode of described diode D7 is the input of steady-state supply unit, be connected with described secondary coil, the negative electrode of described diode D7 connects first end of described the 3rd switch element, first end of described the 3rd switch element is also by capacitor C 6 ground connection, be connected with divider resistance R38 between first end of described the 3rd switch element and the control end, the control end of described the 3rd switch element is also by voltage-stabiliser tube Z1 ground connection, be connected with diode D14 between first end of described the 3rd switch element and second end, second end of described the 3rd switch element is second output of steady-state supply unit, second end of described the 3rd switch element also connects the anode of diode D8, and the negative electrode of described diode D8 is first output of steady-state supply unit.
6. the power circuit of led drive circuit as claimed in claim 5, it is characterized in that, described the 3rd switch element is triode Q5, and first end of very described the 3rd switch element of the current collection of described triode Q5 connects the emitter of described triode Q5 by diode D14; Second end of very described the 3rd switch element of the emission of described triode Q5, and connect the control end of described transient state power supply unit; The base stage of described triode Q5 is the control end of described the 3rd switch element, is connected with the collector electrode of described triode Q5 by divider resistance R38.
7. a led drive circuit is characterized in that, described led drive circuit comprises the power circuit as each described led drive circuit of claim 1-6.
8. a LED light fixture is characterized in that, described LED light fixture comprises led drive circuit as claimed in claim 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010207711A CN101873070A (en) | 2010-06-22 | 2010-06-22 | LED (light-emitting diode) drive circuit and power supply circuit and LED lamp thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010207711A CN101873070A (en) | 2010-06-22 | 2010-06-22 | LED (light-emitting diode) drive circuit and power supply circuit and LED lamp thereof |
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| Publication Number | Publication Date |
|---|---|
| CN101873070A true CN101873070A (en) | 2010-10-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010207711A Pending CN101873070A (en) | 2010-06-22 | 2010-06-22 | LED (light-emitting diode) drive circuit and power supply circuit and LED lamp thereof |
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| CN (1) | CN101873070A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103023309A (en) * | 2011-09-22 | 2013-04-03 | Tdk株式会社 | Power supply device and light-emitting element drive device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201440615U (en) * | 2009-08-27 | 2010-04-21 | 惠州三华工业有限公司 | AC power-off quick response and AC filtering capacitance discharging circuit |
-
2010
- 2010-06-22 CN CN201010207711A patent/CN101873070A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201440615U (en) * | 2009-08-27 | 2010-04-21 | 惠州三华工业有限公司 | AC power-off quick response and AC filtering capacitance discharging circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103023309A (en) * | 2011-09-22 | 2013-04-03 | Tdk株式会社 | Power supply device and light-emitting element drive device |
| CN103023309B (en) * | 2011-09-22 | 2015-02-04 | Tdk株式会社 | Power supply device and light-emitting element drive device |
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Application publication date: 20101027 |